dgrey

Table of Contents

dgrey is a greylisting policy server that allows greylist information to be
synchronized between multiple mail servers. All information is shared
between the nodes and the nodes are equal - there is no master. The nodes
may lose communication for a while, and still be able to correctly
resynchronize later. This works because all nodes keep a log of changes to
the database. All communication is done across TCP connections, which can
optionally be password protected.

dgrey works with mail transfer agents such as Postfix and Exim.

dgrey is written in Perl by Oskar Liljeblad. It is partially based on and
heavily inspired by Postgrey by David Schweikert.